697664357 has 4 divisors (see below), whose sum is σ = 751330860. Its totient is φ = 643997856.

The previous prime is 697664353. The next prime is 697664399. The reversal of 697664357 is 753466796.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 131652676 + 566011681 = 11474^2 + 23791^2 .

It is a cyclic number.

It is not a de Polignac number, because 697664357 - 2² = 697664353 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 697664299 and 697664308.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (697664353) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26833232 + ... + 26833257.

It is an arithmetic number, because the mean of its divisors is an integer number (187832715).

Almost surely, 2^697664357 is an apocalyptic number.

It is an amenable number.

697664357 is a deficient number, since it is larger than the sum of its proper divisors (53666503).

697664357 is a wasteful number, since it uses less digits than its factorization.

697664357 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53666502.

The product of its digits is 5715360, while the sum is 53.

The square root of 697664357 is about 26413.3367259799. The cubic root of 697664357 is about 886.9153647977.

The spelling of 697664357 in words is "six hundred ninety-seven million, six hundred sixty-four thousand, three hundred fifty-seven".